Hmm, duopolies don't work you say? I doubt 3 will make any difference (see memory manufacturers). Then again looking at market share nvidia is a monopoly in practice.

The bad part is everyone wants to be on the AI money circle line train (see the various money flow images available) and thus everything caters for that. At this point i'd rather have nvidia and amd quit the gpu business and focus on "ai" only, that way a new competitor can enter the business and cater the the niche applications like consumer gpus.